Nitrogen in Terrestrial Ecosystems: Questions of by Prof. Dr. Carl Olof Tamm (auth.)

By Prof. Dr. Carl Olof Tamm (auth.)

Nitrogen is a key aspect in atmosphere techniques. elements of neighborhood and international alterations in nitrogen in either undisturbed and disturbed stipulations are mentioned. Environmental adjustments because of pollutants from nitrogenous compounds and alterations in landuse also are defined. Organisms, vegetation, animals and microorganisms are all affecting nitrogen provide. Emphasis is put on ordinary and anthropogenic move of nitrogen among ecosystems and in addition at the interplay of nitrogen with different bioelements.

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Extra resources for Nitrogen in Terrestrial Ecosystems: Questions of Productivity, Vegetational Changes, and Ecosystem Stability

Example text

1 presents a highly schematie picture of a complex reality. Processes designated as biologically eontrolled are of course also influeneed by the abiotic environment, both directly and indirectly. In the case of soilleaching, the direction and intensity of flow is mainly abiotically regulated, while biological processes influenee the coneentrations of solutes in the soil solution. ) are the main agents. Indirectly, animals influenee all processes designated as biologically controlled, by influencing the growth and vigour of plant components of the ecosystem.

Soil capillary rise Lower Upper soil horizon 7. Litter incorporation in mineral soil Litter layer Mineral horizons Abiotic + +++ +++ 'Fhe plus signs signify degree of control: + some, + + moderate, + + + strong. Minus sign: no direct influence. 2. The central theme in this seetion is not so mueh the transfer proeesses per se, but rather how transport mechanisms in the eeosystem, both for nitrogen and for other elements, are influenced by ehanges in nitrogen abundance. 1 lists some of the proeesses which are of special significance for the loeal nitrogen cycle, either beeause of the quantities transferred, or because the nitrogen transfer is rate determining for other important ecosystem proeesses.

Redistribution in plants Plant Plant +++ 4. Canopy leaching, stern flow Plant Soil ++ ++ 5. Soil leaching Upper Lower soil horizon ++ +++ 6. Soil capillary rise Lower Upper soil horizon 7. Litter incorporation in mineral soil Litter layer Mineral horizons Abiotic + +++ +++ 'Fhe plus signs signify degree of control: + some, + + moderate, + + + strong. Minus sign: no direct influence. 2. The central theme in this seetion is not so mueh the transfer proeesses per se, but rather how transport mechanisms in the eeosystem, both for nitrogen and for other elements, are influenced by ehanges in nitrogen abundance.

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